Github user marmbrus commented on the pull request:
https://github.com/apache/spark/pull/6237#issuecomment-103537589
I believe it is the SQL standard that says they should return null.
On May 19, 2015 1:51 AM, "Cheng Hao" <[email protected]> wrote:
> From this point of view, I think it's reasonable to say aggregation
> functions should always be nullable, but depends on different use
> scenarios. (with / without grouping keys)
>
> â
> Reply to this email directly or view it on GitHub
> <https://github.com/apache/spark/pull/6237#issuecomment-103402444>.
>
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